Name:

 

 

You are analyzing the water from five lakes for the presence of bacteria.

 

Your hypothesis is:

The lake with the warmest water will have the most bacteria.

 

Your experimental design is to streak each agar plate with a drop of water from one lake for a total of five plates (one for each lake).  The agar is the same in each plate and the plates are kept together in the same growing conditions.  At a certain time you inspect each plate and record the number of colonies (or spots) and the number of different shapes.

 

 

What is your Amanipulated@ or independent variable.

What is your Aresponding@ or dependent variable.

What are some constants in this experiment.

Is there a control in this experiment - if yes, indicate what it is.  If no, what would you suggest for a control.

 

You collect the following data:                            Lake A is 18 C

Lake B is 32 C

Lake C is 28 C

Lake D is 25 C

Lake E is 24 C

 

The Agar plate from Lake A has a total of 13 spots with 6 different shapes

The Agar plate from Lake B has a total of 23 spots with 8 different shapes

The Agar plate from Lake C has a total of 8 spots with 8 different shapes

The Agar plate from Lake D has a total of 10 spots with 10 different shapes

The Agar plate from Lake E has a total of 11 spots with 10 different shapes

 

Does the data support or refute your hypothesis.  Remember you are looking at the response of one variable to the other. Justify your conclusion.

 What would your next experiment be?